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ip: reassembly: fix use-after-free

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When processing the last buffer of a reassembled packet, the current
buffer will be freed and must be reloaded using the updated index.

Type: fix

Change-Id: Ib39e29e60eb527b4cd4828a3aa37d82c8dddd709
Signed-off-by: Benoît Ganne <bganne@cisco.com>
(cherry picked from commit cf7803d2e864fb71f14943a544ac309d3d0510cb)
This commit is contained in:
Benoît Ganne
2019-10-23 13:53:49 +02:00
committed by Andrew Yourtchenko
parent 442870c03a
commit 82ae1a485e
2 changed files with 10 additions and 5 deletions
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7
src/vnet/ip/reass/ip4_full_reass.c
View File

@ -1208,13 +1208,17 @@ ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
packet_enqueue:
b0->error = node->errors[error0];
if (bi0 != ~0)
{
to_next[0] = bi0;
to_next += 1;
n_left_to_next -= 1;
/* bi0 might have been updated by reass_finalize, reload */
b0 = vlib_get_buffer (vm, bi0);
b0->error = node->errors[error0];
if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
{
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
@ -1233,7 +1237,6 @@ ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
}
else if (is_feature && IP4_ERROR_NONE == error0)
{
b0 = vlib_get_buffer (vm, bi0);
vnet_feature_next (&next0, b0);
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,

8
src/vnet/ip/reass/ip6_full_reass.c
View File

@ -1168,14 +1168,17 @@ ip6_full_reassembly_inline (vlib_main_t * vm,
error0 = IP6_ERROR_REASS_LIMIT_REACHED;
}
b0->error = node->errors[error0];
if (~0 != bi0)
{
skip_reass:
to_next[0] = bi0;
to_next += 1;
n_left_to_next -= 1;
/* bi0 might have been updated by reass_finalize, reload */
b0 = vlib_get_buffer (vm, bi0);
b0->error = node->errors[error0];
if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
{
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
@ -1194,7 +1197,6 @@ ip6_full_reassembly_inline (vlib_main_t * vm,
}
else if (is_feature && IP6_ERROR_NONE == error0)
{
b0 = vlib_get_buffer (vm, bi0);
vnet_feature_next (&next0, b0);
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,